APA ציטוט

Grubel, H. G. (1971). Effective tariff protection. Geneva: General Agreement on Tariff and Trade.

Trích dẫn kiểu Chicago

Grubel, Herbert G. Effective Tariff Protection. Geneva: General Agreement on Tariff and Trade, 1971.

ציטוט MLA

Grubel, Herbert G. Effective Tariff Protection. Geneva: General Agreement on Tariff and Trade, 1971.